You'll be left with a bunch of 1X4's and 1X6's attached to the 2x4 in the center.
By rocking the 1x4's and the 1x6's back and forth, you can get the board off without totally destroying it.
There will still be quite a few ruined boards. Good for the woodstove.
Pull or remove any nails left in the board and stack it to the side. You may also want to grade your boards, based on knots, warping, bark, etc. This will help later when you try to decide what to use for what job.